include/sys/vdev.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #ifndef _SYS_VDEV_H
  26 #define _SYS_VDEV_H
  27
  28 #include <sys/spa.h>
  29 #include <sys/zio.h>
  30 #include <sys/dmu.h>
  31 #include <sys/space_map.h>
  32 #include <sys/fs/zfs.h>
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38 typedef enum vdev_dtl_type {
  39         DTL_MISSING,    /* 0% replication: no copies of the data */
  40         DTL_PARTIAL,    /* less than 100% replication: some copies missing */
  41         DTL_SCRUB,      /* unable to fully repair during scrub/resilver */
  42         DTL_OUTAGE,     /* temporarily missing (used to attempt detach) */
  43         DTL_TYPES
  44 } vdev_dtl_type_t;
  45
  46 extern int zfs_nocacheflush;
  47
  48 extern int vdev_open(vdev_t *);
  49 extern void vdev_open_children(vdev_t *);
  50 extern boolean_t vdev_uses_zvols(vdev_t *);
  51 extern int vdev_validate(vdev_t *);
  52 extern void vdev_close(vdev_t *);
  53 extern int vdev_create(vdev_t *, uint64_t txg, boolean_t isreplace);
  54 extern void vdev_reopen(vdev_t *);
  55 extern int vdev_validate_aux(vdev_t *vd);
  56 extern zio_t *vdev_probe(vdev_t *vd, zio_t *pio);
  57
  58 extern boolean_t vdev_is_bootable(vdev_t *vd);
  59 extern vdev_t *vdev_lookup_top(spa_t *spa, uint64_t vdev);
  60 extern vdev_t *vdev_lookup_by_guid(vdev_t *vd, uint64_t guid);
  61 extern void vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t d,
  62     uint64_t txg, uint64_t size);
  63 extern boolean_t vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t d,
  64     uint64_t txg, uint64_t size);
  65 extern boolean_t vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t d);
  66 extern void vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg,
  67     int scrub_done);
  68 extern boolean_t vdev_dtl_required(vdev_t *vd);
  69 extern boolean_t vdev_resilver_needed(vdev_t *vd,
  70     uint64_t *minp, uint64_t *maxp);
  71
  72 extern void vdev_hold(vdev_t *);
  73 extern void vdev_rele(vdev_t *);
  74
  75 extern int vdev_metaslab_init(vdev_t *vd, uint64_t txg);
  76 extern void vdev_metaslab_fini(vdev_t *vd);
  77 extern void vdev_metaslab_set_size(vdev_t *);
  78 extern void vdev_expand(vdev_t *vd, uint64_t txg);
  79 extern void vdev_split(vdev_t *vd);
  80
  81
  82 extern void vdev_get_stats(vdev_t *vd, vdev_stat_t *vs);
  83 extern void vdev_clear_stats(vdev_t *vd);
  84 extern void vdev_stat_update(zio_t *zio, uint64_t psize);
  85 extern void vdev_scan_stat_init(vdev_t *vd);
  86 extern void vdev_propagate_state(vdev_t *vd);
  87 extern void vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state,
  88     vdev_aux_t aux);
  89
  90 extern void vdev_space_update(vdev_t *vd,
  91     int64_t alloc_delta, int64_t defer_delta, int64_t space_delta);
  92
  93 extern uint64_t vdev_psize_to_asize(vdev_t *vd, uint64_t psize);
  94
  95 extern int vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux);
  96 extern int vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux);
  97 extern int vdev_online(spa_t *spa, uint64_t guid, uint64_t flags,
  98     vdev_state_t *);
  99 extern int vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags);
 100 extern void vdev_clear(spa_t *spa, vdev_t *vd);
 101
 102 extern boolean_t vdev_is_dead(vdev_t *vd);
 103 extern boolean_t vdev_readable(vdev_t *vd);
 104 extern boolean_t vdev_writeable(vdev_t *vd);
 105 extern boolean_t vdev_allocatable(vdev_t *vd);
 106 extern boolean_t vdev_accessible(vdev_t *vd, zio_t *zio);
 107
 108 extern void vdev_cache_init(vdev_t *vd);
 109 extern void vdev_cache_fini(vdev_t *vd);
 110 extern int vdev_cache_read(zio_t *zio);
 111 extern void vdev_cache_write(zio_t *zio);
 112 extern void vdev_cache_purge(vdev_t *vd);
 113
 114 extern void vdev_queue_init(vdev_t *vd);
 115 extern void vdev_queue_fini(vdev_t *vd);
 116 extern zio_t *vdev_queue_io(zio_t *zio);
 117 extern void vdev_queue_io_done(zio_t *zio);
 118
 119 extern void vdev_config_dirty(vdev_t *vd);
 120 extern void vdev_config_clean(vdev_t *vd);
 121 extern int vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg,
 122     boolean_t);
 123
 124 extern void vdev_state_dirty(vdev_t *vd);
 125 extern void vdev_state_clean(vdev_t *vd);
 126
 127 typedef enum vdev_config_flag {
 128         VDEV_CONFIG_SPARE = 1 << 0,
 129         VDEV_CONFIG_L2CACHE = 1 << 1,
 130         VDEV_CONFIG_REMOVING = 1 << 2
 131 } vdev_config_flag_t;
 132
 133 extern void vdev_top_config_generate(spa_t *spa, nvlist_t *config);
 134 extern nvlist_t *vdev_config_generate(spa_t *spa, vdev_t *vd,
 135     boolean_t getstats, vdev_config_flag_t flags);
 136
 137 /*
 138  * Label routines
 139  */
 140 struct uberblock;
 141 extern uint64_t vdev_label_offset(uint64_t psize, int l, uint64_t offset);
 142 extern int vdev_label_number(uint64_t psise, uint64_t offset);
 143 extern nvlist_t *vdev_label_read_config(vdev_t *vd);
 144 extern void vdev_uberblock_load(zio_t *zio, vdev_t *vd, struct uberblock *ub);
 145
 146 typedef enum {
 147         VDEV_LABEL_CREATE,      /* create/add a new device */
 148         VDEV_LABEL_REPLACE,     /* replace an existing device */
 149         VDEV_LABEL_SPARE,       /* add a new hot spare */
 150         VDEV_LABEL_REMOVE,      /* remove an existing device */
 151         VDEV_LABEL_L2CACHE,     /* add an L2ARC cache device */
 152         VDEV_LABEL_SPLIT        /* generating new label for split-off dev */
 153 } vdev_labeltype_t;
 154
 155 extern int vdev_label_init(vdev_t *vd, uint64_t txg, vdev_labeltype_t reason);
 156
 157 #ifdef  __cplusplus
 158 }
 159 #endif
 160
 161 #endif  /* _SYS_VDEV_H */